Top Posts Tagged with #magicalrecord

Restkit and MagicalRecord

Recently, I worked on a project where the app had to download a lot of JSON data and store the results in Core Data.

I decided this was a good time to try out some frameworks, so I installed the pods for RestKit and MagicalRecord.

With RestKit, you make a mapping, like:

@{@"job_name":@"jobName"}

Then you pass that on to the framework, along with the URL and other info, and it automatically downloads, parses, and saves that data into Core Data.

MagicalRecord also has convenience methods for importing JSON into Core Data. Just follow the instructions in their documentation. You go into your data model, and populate the User Info (right hand side). Let's say you have a field called "displayName" and the JSON object has a "display_name" field. For the "displayName" field, you would add a key called "mappedKeyName" and the value would be "display_name".

Once you've finished adding keys to the entity, to import something, you'd call:

Person *importedPerson = [Person MR_importFromObject:contactInfo];

So, just make a few edits and the framework does the rest. Great, right? Well, it depends. If the JSON object is fairly simple, and you're importing 10 at a time, sure. If the JSON object is gnarly, with multiple subarrays and dictionaries, AND you have to import 50 at a time AND establish relationships among them, not so much. I tried both frameworks, but I felt like I had to do too much work to shoehorn the frameworks into my code.

I ended using AFNetworking to download the JSON, then on completion, I manually looped through all the JSON dictionaries and loaded them into Core Data. For this, I used MagicalRecord's saveWithBlock method. While I didn't use its convenience method for importing JSON, MagicalRecord still has a lot of great utilities.

It sets up a decent NSManagedObjectContext stack for you. The stack follows best practices, and uses a persistent store->private queue context (root)->main queue context (default). When you save, it creates a throwaway private context, and makes it a child of the root (private) context. Overall, MagicalRecord eliminates a lot of Core Data boilerplate.

One last thing, don't forget to use Apple's best practices for bulk imports. Basically, if you're importing 50 JSON objects, you want to avoid doing 50 cycles of fetch/check id->create/update->save. Instead, loop through all the objects' unique IDs, and do one fetch using an "id IN" predicate. This gets the old records. Then do another loop and if an ID is not an old record, you create a new one. So that's only one fetch and one save vs. 50 fetches + saves.

#ios #magicalrecord #restkit #json #coredata

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Key Value Observing on NSManagedObject through MagicalRecord

If you want to track the change of a NSManagedObject with MagicalRecord. Except NSFetchedResultsController, here is something you can do:

MagicalRecord's default NSManagedObjectContext will listen to the NSManagedObjectContextDidSaveNotification notification and merge the changes into its managed objects. That is why you can track the changes with objects fetched from the default context.

I think this is quite useful.

#core data #magicalrecord #ios

Xcode 5, Core Data и юнит-тесты

Пришла мне как-то идея новой программы для айФона для подсчета количества явлениий и показа статистки. Ничего сложного и ничего серьезного, за недельку по вечерам думаю напишу. Интерфейс в несколько UIViews и UIViewControllers, да данные записывать в CoreData. Когда я начинал писать SunFollower, я все размышлял о том, как же юнит-тестировать CoreData. И вот вчера, пока создавал проект для новой идеи и разбирался c юнит-тестами, кое-какие идеи появились. О чем и собраюсь поведать. Что такое Core Data, я писать не буду. Это целая отдельная история. Буду считать, что мой читатель знаком с этой технологией.

#ios #xcode 5 #continious integration #core data #magicalrecord #unit test #iosdev

What made me crazy when i did with Core Data

Dealing with Core Data is not easy, it's not like grab something then hope.

I got an experience when play around with Core Data, Mogenerator and Magical Record.

At first, you make to create Models structures, for me it's like this

Then you install the Mogenerator, run this command

After you run this command, it will generate some files at the location that you chose. Grab the files into your project.

Then download the Magical Record, grab into your project. Try to compile code, if there were some errors about the Magical Record. Let import this line into your Prefix file.

#ios #coredata #magicalrecord #mogenerator